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Abstract:

A heating device for cutting tools has an outer casing, a power source, a
cover board, a magnetizer and two conductive coils. The outer casing has
an opening. The cover board is mounted securely on the top of the outer
casing to cover the opening and has two through holes communicating with
the opening. The magnetizer is mounted in the outer casing and has a
conducting body. The conducting body is mounted in the outer casing,
extends in the through holes of the cover board via the opening and has a
middle and two free ends respectively extending in the through holes of
the cover board. The conductive coils are respectively mounted around the
free ends of the conducting body, abut the cover board and are
electrically connected to the power source of the outer casing.

Claims:

1. A heating device for cutting tools comprising: an outer casing being
hollow and having a top; and an opening formed through the top of the
outer casing; a power source mounted in the outer casing to supply an
alternating current; a cover board mounted securely on the top of the
outer casing to cover the opening of the outer casing and having a top; a
bottom; a flat surface formed on the top of the cover board; and two
through holes formed through the flat surface of the cover board at an
interval and communicating with the opening of the outer casing; a
magnetizer mounted in the outer casing and having a conducting body
mounted in the outer casing, extending in the through holes of the cover
board via the opening of the outer casing and having a middle mounted in
the outer casing; and two free ends formed on and protruding from the
middle of the conducting body, respectively extending in the through
holes of the cover board and each free end has an outer face being flush
with the flat surface of the cover board; and two conductive coils
mounted around the conducting body of the magnetizer respectively near
the free ends of the conducting body, abutting the cover board and
electrically connected to the power source of the outer casing.

2. The heating device for cutting tools as claimed in claim 1, wherein
the magnetizer has two conducting elements respectively mounted on the
free ends of the conducting body to hold a cutting tool securely on the
magnetizer.

3. The heating device for cutting tools as claimed in claim 2, wherein
the conducting elements are sheets and each conducting element has a side
having an area; and a surface connected to the side of the conducting
element, having an area larger than the area of the side of the
conducting element and abutting one of the free ends of the conducting
body to hold a cutting tool.

4. The heating device for cutting tools as claimed in claim 2, wherein
the conducting elements are sheets and each conducting element has a
surface having an area; and a side connected to the surface of the
conducting element, having an area smaller than the area of the surface
of the conducting element and mounted on the outer face of one of the
free ends of the conducting body at a right angle relative to the outer
face of the corresponding free end of the conducting body to hold a
cutting tool.

5. The heating device for cutting tools as claimed in claim 1, wherein
the conducting body is U-shaped.

6. The heating device for cutting tools as claimed in claim 2, wherein
the conducting body is U-shaped.

7. The heating device for cutting tools as claimed in claim 3, wherein
the conducting body is U-shaped.

8. The heating device for cutting tools as claimed in claim 4, wherein
the conducting body is U-shaped.

Description:

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a heating device, and more
particularly to a heating device for cutting tools to heat the cutting
tools conveniently.

[0003] 2. Description of Related Art

[0004] A cutting tool has a tool shaft and a collet. Before the tool shaft
of the cutting tool being mounted securely in the collet, the collet is
heated by a conventional heating device to make a shaft hole of the
collet slightly expand to allow the tool shaft to be inserted into the
shaft hole. However, the conventional heating device is not convenient in
use.

[0005] Therefore, the present invention provides a heating device for
cutting tools to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

[0006] The main objective of the present invention is to provide a heating
device for cutting tools that can heat the cutting tools conveniently.

[0007] The heating device for cutting tools in accordance with the present
invention has an outer casing, a power source, a cover board, a
magnetizer and two conductive coils. The outer casing has an opening. The
cover board is mounted securely on the top of the outer casing to cover
the opening and has two through holes communicating with the opening. The
magnetizer is mounted in the outer casing and has a conducting body. The
conducting body is mounted in the outer casing, extends in the through
holes of the cover board via the opening and has a middle and two free
ends respectively extending in the through holes of the cover board. The
conductive coils are respectively mounted around the conducting body of
the magnetizer at the free ends of the conducting body, abut the cover
board and are electrically connected to the power source of the outer
casing.

[0008] Other objectives, advantages and novel features of the invention
will become more apparent from the following detailed description when
taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009]FIG. 1 is a perspective view in partial section of a first
embodiment of a heating device for cutting tools in accordance with the
present invention;

[0010]FIG. 2 is an enlarged side view in partial section of the heating
device in FIG. 1;

[0011]FIG. 3 is an enlarged perspective view of a magnetizer and two
conductive coils of the heating device in FIG. 1;

[0012]FIG. 4 is a perspective view of a second embodiment of a heating
device for cutting tools in accordance with the present invention; and

[0013]FIG. 5 is a perspective view of a third embodiment of a heating
device for cutting tools in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0014] With reference to FIGS. 1 to 3, a heating device for cutting tools
50 in accordance with the present invention comprises an outer casing 10,
a power source 12, a cover board 20, a magnetizer 30 and two conductive
coils 40.

[0015] The outer casing 10 is hollow and has a top and an opening 11. The
opening 11 is formed through the top of the outer casing 10.

[0016] The power source 12 is mounted in the outer casing 10 to supply an
alternating current.

[0017] The cover board 20 may be made of insulation materials (such as
bakelite), is mounted securely on the top of the outer casing 10 to cover
the opening 11 of the outer casing 10 and has a top, a bottom, a flat
surface and two through holes 21. The flat surface may be rectangular and
is formed on the top of the cover board 20. The through holes 21 are
formed through the flat surface of the cover board 20 at an interval and
communicate with the opening 11 of the outer casing 10.

[0018] The magnetizer 30 is mounted in the outer casing 10 and has a
conducting body 31 and two conducting elements 32 as shown in FIGS. 4 and
5. The conducting body 31 may be U-shaped, is mounted in the outer casing
10, extends in the through holes 21 of the cover board 20 via the opening
11 of the. outer casing 10 and has a middle 312 and two free ends 311.
Furthermore, the conducting body 31 may be made of metallic materials
with high magnetic permeability. The middle 312 of the conducting body 31
is mounted in the outer casing 10. The free ends 311 of the conducting
body 31 are formed on and protrude from the middle 312 of the conducting
body 31, respectively extend in the through holes 21 of the cover board
20 and each free end 311 of the conducting body 31 has an outer face. The
outer faces of the free ends 311 of the conducting body 31 are flush with
the flat surface of the cover board 20.

[0019] With reference to FIGS. 4 and 5, the conducting elements 32 may be
sheets, are respectively mounted on the free ends 311 of the conducting
body 31 to hold a cutting tool 50 securely on the magnetizer 30 and each
conducting element 32 has a surface and a side connected to the surface.
The surface of the conducting element 32 has an area. The side of the
conducting element 32 has an area smaller than that of the surface of the
conducting element 32. The surfaces of the conducting elements 32 may
respectively abut the outer faces of the free ends 311 of the conducting
body 31 as shown in FIG. 4 or the sides of the conducting elements 32 are
respectively mounted on the outer faces of the free ends 311 of the
conducting body 31 at right angles relative to the outer faces of the
free ends 311 of the conducting body 31 as shown in FIG. 5.

[0020] The conductive coils 40 are mounted around the conducting body 31
of the magnetizer 30 respectively near the free ends 311 of the
conducting body 31, abut the bottom of the cover board 20 and are
electrically connected to the power source 12 of the outer casing 10.

[0021] In operation, a cutting tool 50 is mounted on the free ends 311 of
the conducting body 31 as shown in FIG. 1 or may be securely held between
the conducting elements 32 as shown in FIGS. 4 and 5 to allow the cutting
tool 50 to mount securely on the free ends 311 of the conducting body 31.
When the alternating current is imported into the conductive coils 40
from the power source 12 of the outer casing 10, the conducting body 31
of the magnetizer 30 will be induced to form multiple magnetic lines
between the free ends 311 of the conducting body 31 through
electromagnetic induction. When the magnetic lines are formed between the
free ends 311 of the conducting body 31, the magnetic lines will pass
through the cutting tool 50 to form heat energy to the cutting tool 50.
Thus, the cutting tool 50 can be heated conveniently by mounting the
cutting tool 50 on the free ends 311 of the conducting body 31 and
turning on the power source 12 of the outer casing 10. In addition, the
conducting elements 32 that hold the cutting tool 50 can increase the
amount of the magnetic lines to pass through the cutting tool 50 and this
can shorten the heating time of heating the cutting tool 50 to enhance
the heating efficiency of the heating device in accordance with the
present invention.

[0022] Even though numerous characteristics and advantages of the present
invention have been set forth in the foregoing description, together with
details of the structure and features of the invention, the disclosure is
illustrative only. Changes may be made in the details, especially in
matters of shape, size, and arrangement of parts within the principles of
the invention to the full extent indicated by the broad general meaning
of the terms in which the appended claims are expressed.